Smashing up halves of creamy avocado and using it as a toast topper (perhaps with a squeeze of lime, some chopped coriander and diced chillis, or with a twist of lemon, ground black pepper and a liberal scattering of sea salt... sorry, we digress) is the wellness-lover's breakfast go-to.

But just like #eatclean, it looks like the craze is now firmly in the mainstream.

Yes, Japanese outlets of McDonald's have jumped in on the trend, with a bacon, lettuce and avocado muffin.